Grokking Design Patterns for Engineers and Managers
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Adapter Pattern

The Adapter Pattern makes an incompatible interface fit the one your code already expects.

Your application speaks one interface. Something you need to use speaks another. A payment library exposes charge(amountInCents, currencyCode), while your checkout calls pay(Money). A legacy service returns XML and everything downstream expects JSON. An analytics client wants track(String, Map) and your code produces an Event.

You cannot change the other side. It is a vendor library, another team's service, or code that fifty other callers depend on

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